CircleCI

Building, testing, and deploying your Jekyll-generated website can quickly be done with CircleCI, a continuous integration & delivery tool. CircleCI supports GitHub and Bitbucket, and you can get started for free using an open-source or private repository.

1. Follow Your Project on CircleCI

To start building your project on CircleCI, all you need to do is ‘follow’ your project from CircleCI’s website:

  1. Visit the ‘Add Projects’ page: https://circleci.com/add-projects
  2. From the GitHub or Bitbucket tab on the left, choose a user or organization.
  3. Find your project in the list and click ‘Build project’ on the right.
  4. The first build will start on its own. You can start telling CircleCI how to build your project by creating a circle.yml file in the root of your repository.

2. Dependencies

The easiest way to manage dependencies for a Jekyll project (with or without CircleCI) is via a Gemfile. You’d want to have Jekyll, any Jekyll plugins, HTML Proofer, and any other gems that you are using in the Gemfile. Don’t forget to version Gemfile.lock as well. Here’s an example Gemfile:

source 'https://rubygems.org'

ruby '2.4.0'

gem 'jekyll'
gem 'html-proofer'

CircleCI detects when Gemfile is present is will automatically run bundle install for you in the dependencies phase.

3. Testing

The most basic test that can be run is simply seeing if jekyll build actually works. This is a blocker, a dependency if you will, for other tests you might run on the generate site. So we’ll run Jekyll, via Bundler, in the dependencies phase.

dependencies:
  post:
    - bundle exec jekyll build

HTML Proofer

With your site built, it’s useful to run tests to check for valid HTML, broken links, etc. There’s a few tools out there but HTML Proofer is popular amongst Jekyll users. We’ll run it in the test phase with a few preferred flags. Check out the html-proofer README for all available flags, or run htmlproofer --help locally.

test:
  post:
    - bundle exec htmlproofer ./_site --check-html --disable-external

Complete Example circle.yml File

When you put it all together, here’s an example of what that circle.yml file could look like in v1:

machine:
  environment:
    NOKOGIRI_USE_SYSTEM_LIBRARIES: true # speeds up installation of html-proofer

dependencies:
  post:
    - bundle exec jekyll build

test:
  post:
    - bundle exec htmlproofer ./_site --allow-hash-href --check-favicon --check-html --disable-external

deployment:
  prod:
    branch: master
    commands:
      - rsync -va --delete ./_site username@my-website:/var/html

for CircleCI v2, a Docker-based system which new projects will follow, set the S3_BUCKET_NAME environment variable (an example of the required config file is shown below).

defaults: &defaults
  working_directory: ~/repo
version: 2
jobs:
  build:
    <<: *defaults
    docker:
      - image: circleci/ruby:2.5
    environment:
      BUNDLE_PATH: ~/repo/vendor/bundle
    steps:
      - checkout
      - restore_cache:
          keys:
            - rubygems-v1-{{ checksum "Gemfile.lock" }}
            - rubygems-v1-fallback
      - run:
          name: Bundle Install
          command: bundle check || bundle install
      - run:
          name: HTMLProofer tests
          command: |
            bundle exec htmlproofer ./_site \
              --allow-hash-href \
              --check-favicon  \
              --check-html \
              --disable-external
      - save_cache:
          key: rubygems-v1-{{ checksum "Gemfile.lock" }}
          paths:
            - vendor/bundle
      - run:
          name: Jekyll build
          command: bundle exec jekyll build
      - persist_to_workspace:
          root: ./
          paths:
            - _site
  deploy:
    <<: *defaults
    docker:
      - image: circleci/python:3.6.3
    environment:
      S3_BUCKET_NAME: <<YOUR BUCKET NAME HERE>>
    steps:
      - attach_workspace:
          at: ./
      - run:
          name: Install AWS CLI
          command: pip install awscli --upgrade --user
      - run:
          name: Upload to s3
          command: ~/.local/bin/aws s3 sync ./_site s3://$S3_BUCKET_NAME/ --delete --acl public-read
workflows:
  version: 2
  test-deploy:
    jobs:
      - build
      - deploy:
          requires:
            - build
          filters:
            branches:
              only: master

Questions?

This entire guide is open-source. Go ahead and edit it if you have a fix or ask for help if you run into trouble and need some help. CircleCI also has an online community for help.